题目内容

试找出下文的段落主旨句。请看一组数字。从20世纪初至70年代中期,全世界农业用水增长7倍,而工业用水量增长20倍。目前,已有63个国家和地区面临缺水危机。我国是一个淡水资源贫乏的国家,人均淡水只及世界平均水平的1/4,居世界第84位。我国淡水资源的分布与人口和耕地的分布是不相适应的,80%集中在长江以南,许多城市已进入生活缺水期,……我国将面临缺水危机。

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